| 已知圆上任意三点坐标已知圆上任意三点坐标，求圆心坐标及半径程序： LbI 0 {A,B,D,E,F,G} A"X1":B"Y1":D"X2":E"Y2":F"X3":G"Y3" I=0:J=0 Pol ((A-F),(B-G)) J≥0=>H=J△ J≤0=>H=J+360△ Pol ((A-D),(B-E)) J≥0=>K=J△ J≤0=>K=J+360△ L=((B+G)/2+(A+D)/2/COS(H+90)*SIN(H+90)-(A+F)/2/COS(H+90)*SIN(H+90)-(B+E)/2)/(SIN(K-90)-COS(K-90)*SIN(H+90)/COS(H+90)) X=(A+D)/2+L*COS(K-90)▲ Y=(B+E)/2+L*SIN(K-90)▲ R=√((X-A)^2+(Y-B)^2)▲ Goto 0 |
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